chore: Simplify GitHub Actions Workflow

[gaby]

• Remove EOL versions of Go (Anything below 1.20)
• Add support for testing against Redis 6 and 7
• Add recent version of Go to test matrix
• Remove cache test, since setup-go now does Caching by default
• Update versions of all GitHub Actions
• Use gotestsum to run tests
• Add -race to detect race conditions
• Add -shuffle to run tests in random order.
• Fixed issue causing CI to run twice (push/pr)

[gaby]

Let me change the action for Redis to one that doesn't use Docker

[xyproto]

Cool! A definite improvement. 👍 😄

[gaby]

@xyproto Good to merge?

[xyproto]

Ah, yes! Thanks for the reminder. Merged. 👍